eVGA AGP cards

Is there something about certain video cards that cause problems whereas other ones (brands or types) don't?

I don't know much about video cards and all the factors involved but I helped buy a (cheaper) video graphics card for a friend and it kept crashing his computer. It's an integrated 'eMachines type' but a BFG video graphics card works but the eVGA one I got didn't work. It would crash the computer repeatedly. He replaced his BFG card with another (same specs and card) and it works. The previous one would freeze at certain points in the game but now it's not doing that (with the replacement BFG card).

It suggests to me that eVGA has crappy hardware. It's a 6200 while the BFG card is 5700. I wouldn't game with low end cards but still, it's a PITA and now I have to see if it can be returned. I'll never get a eVGA card again.